-16t^2-18t+315=0

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Solution for -16t^2-18t+315=0 equation:


Simplifying
-16t2 + -18t + 315 = 0

Reorder the terms:
315 + -18t + -16t2 = 0

Solving
315 + -18t + -16t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-19.6875 + 1.125t + t2 = 0

Move the constant term to the right:

Add '19.6875' to each side of the equation.
-19.6875 + 1.125t + 19.6875 + t2 = 0 + 19.6875

Reorder the terms:
-19.6875 + 19.6875 + 1.125t + t2 = 0 + 19.6875

Combine like terms: -19.6875 + 19.6875 = 0.0000
0.0000 + 1.125t + t2 = 0 + 19.6875
1.125t + t2 = 0 + 19.6875

Combine like terms: 0 + 19.6875 = 19.6875
1.125t + t2 = 19.6875

The t term is 1.125t.  Take half its coefficient (0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
1.125t + 0.31640625 + t2 = 19.6875 + 0.31640625

Reorder the terms:
0.31640625 + 1.125t + t2 = 19.6875 + 0.31640625

Combine like terms: 19.6875 + 0.31640625 = 20.00390625
0.31640625 + 1.125t + t2 = 20.00390625

Factor a perfect square on the left side:
(t + 0.5625)(t + 0.5625) = 20.00390625

Calculate the square root of the right side: 4.472572666

Break this problem into two subproblems by setting 
(t + 0.5625) equal to 4.472572666 and -4.472572666.

Subproblem 1

t + 0.5625 = 4.472572666 Simplifying t + 0.5625 = 4.472572666 Reorder the terms: 0.5625 + t = 4.472572666 Solving 0.5625 + t = 4.472572666 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + t = 4.472572666 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + t = 4.472572666 + -0.5625 t = 4.472572666 + -0.5625 Combine like terms: 4.472572666 + -0.5625 = 3.910072666 t = 3.910072666 Simplifying t = 3.910072666

Subproblem 2

t + 0.5625 = -4.472572666 Simplifying t + 0.5625 = -4.472572666 Reorder the terms: 0.5625 + t = -4.472572666 Solving 0.5625 + t = -4.472572666 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + t = -4.472572666 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + t = -4.472572666 + -0.5625 t = -4.472572666 + -0.5625 Combine like terms: -4.472572666 + -0.5625 = -5.035072666 t = -5.035072666 Simplifying t = -5.035072666

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.910072666, -5.035072666}

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